Canada



A. J. M DON'ELL Re; 17,270

HYDRAULIC JACK A fil 16, 1929.

Qriginal Filed May 5, 192'? INVENTOR. IQLLHN 1 m mm.

HTTURNE] l leissued Apr. 16, 1929.

UNITED STATES "PATENT; OFFICE, f

AIJLAN J. IMODONELL, OF VANCOUVER, BRITISH GOIL'U'IMIBIA, CANADA,ASSIGNOR, BY MESNE ASSIGNMENTS, TO HYDROJ'AX INCORPORATED, 013 SEATTLE,WASHINGTON,

A CORPORATION OF WASHINGTON.

HYDRAULIC JACK.

O Original No. 1,655,633, dated This invention relates to improvementsin hydraulic jacks and more particularly to'that type of jack that islight and compact in.

form so as to adapt it for use with motor ve- 6 hicles. The automotiveindustry requires that an accessory must be more than work able. It mustbe quick and certain in operation under all conditipns and further itmust be convenient to use. In order to adapt the hydraulic jack to meetthese strict conditions- This arrangement has the further advantage ofreducing in size that portion of the jack.

that must be placed under the part to be lifted. This is of aparticularadvantage when motor Vehicles are built as close to the ground as atpresent.

Another object of my invention is providing a hydraulic jack with apivoted pump and,

reservoir and a folding pump handle. LIII present day automobileconstruction the rear axle is very inaccessible, due to the commonpractice of mounting spare tires and bumpers at the rear of the car. Toovercome this difliculty, I have provided a pivoted pump and reservoirand a pump handle of suflicient length, when extended, as will enableone to properly and easily position the jack without crawling under thecar. For the reason that the ack must be carried in the car at all timesand is used but rarely, I pivot the pump and reservoir to the basecasting of the jack so that it may be folded to lie parallel to the axisof the lifting piston. To further reduce the length of the jack whenstored, I provide a folding joint to the pump handle.

I accomplish these objects by devices illustrated in the accompanyingdrawings, wherein Figure 1 is a sectional view of my invention in,elevation through the center of the to engage the rod 6. The tube 7 issecuredto the hinge cap 8 by the threads 9 and the look I pin 10. Alatch 12 serves to hold the pump handle in operating position and whenhinged about the pin 14 the clip 15 holds the pump handle in storingposition.

A plug casting 17 supports the hinge pin April 10, 1928, Serial- 30.188,421, filed m a, 1927. Application to? reissue I fi1ed.February'11,1929. Serial No. 339,255. 7

14 and forms a closure of the upper end of v the oil storage reservoir18. The lower end of the tube 18 is finished with a tapered portion 19immediately above which is a square shoulder 20. Coacting with theshoulder 20 is the gland nut 22 adapted to secure the -tube18 to thepivot block 23 in a manner permitting a partial revolution of the tube18. In the pivot block 23, or as I have illustrated in a separate piece24 secured thereto are seats for the intake valve 26, the check valve 27and the return flow'valve 28 together with their respective operatingsprings. The intake valve 26 located in the chamber 67 is normally heldby the spring 68 against its seat so as to close the port 69 leadingfrom the reservoir. An

open port 7 0 connects the chamber67 with the pump cylinder. Valves 27and 28 are positioned in a separate chamber 71 and held against theirrespective seats by springs 72 and 7 3. The check valve 27 prevents thereturn of liquid from the chamber 71 tot-he pump cylinder 56. Inengagement with the valve 28 is the tappet 29. Immediately above thetappet 29 is a ring 30 having a passage 32 therethrough, that is securedto the tube 18, andmade integral therewith is a face cam 31, on itslower-side.

which are part of the base 45. A passageway 42 is enclosed in the lug 48which is" given sufficient breadth to prevent leakage of oil.

Secured to the rod 6 is the folding connector 51, shown in the form of acoil spring,

which is in turn connected to the pump piston 52. To prevent oil leakageat this 1 point I .employ a packing nut 53, packing 54 and pressurespring 55. The pump cylinder56 is snugly fittedin the plug 17 but ispermitted to turn therein. At its lower end the cylinder 56 is securedto the member 24 or the pivot block 23 by an oil tight joint.

Secured to the base is the guide casing 60. Operating within the saidguide casing may be any o'rdinary'type of hydraulic piston or a compoundpiston arrangement as shown as pistons 61 and 62 with their operatingwashers 63 and 64 respectively. Attached to the top of the liftingpiston may be a swiveling head 65 or a head made a part of an adjustingscrew 66 as shown.

The method of operating my invention is substantially as follows:Assuming it be desired to jack up the wheel of an automobile, first thecap 8, tube 7 and rod 6 with its handle 5 are unfolded and secured in anoperative position by means of the clip 12. The extended 2 operatingmember is then pivoted about the pin 35until it has reached a positionwhere it will clear the overhanging portion of the car and stillbe in aconvenient operatingposition. The head 65 is then placed directly underits point of engagement with the vehicle. axle or frame. A. pumpingeffort is applied to the pump handle 5 which with its coacting partswithdraws the piston 52. A suctionis created in the chamber 67 throughthe port 70 which opens the valve 26 and fills the void behind the pumppiston 52 with the operating fluid. Qn reaching the limit of the outwardstroke of the piston'52 the valve 26 closes under 'action of its seatingspring 68.

On the inward stroke the check valve 27 is forced from its seat and theoperating fluid is forced in turn through the passages 33, 36, 37, 40and 42 into the chamber 43. This additional fluid in the chamber 43 willlift the lifting piston a given amount. This cycle must be repeateduntil the vehicle has been raised a desired amount. The relative ,areasof the pump piston and the lifting piston, as in all hydraulic jacks,will determine the .rate of lift and the power possible to exert.

1 When it is desired to lower the vehicle, the cam bearing ring 30 isrotated, by application of a rotary eflort on the pump handle 5, untilthe cam 31 begins to engage the tappet 29 and forces the valve 28 fromits seat gradually at a controlled rate. This gives the fluid acontinuous channel through the passages 42,

40, 37 36, 33 and 32 to return to the storage reservoir 18. Circulationon the return is produced by the weight of the vehicle on the head 65.It is apparent that, due to the annular grooves 34 and 4lin the pivotpin 35, the transfer of fluid is unaflected by the angular position ofthe operating member about the pivot pin 35.

It will be obvious from the foregoing that my jack consists of thefollowing elements;

the lifting piston assembly with its passage, the operatingmember,'including the pum the reservoir and valve carrying pivot blocthe pivot connection with its passage, and the folding pump handle,which in combi nation, provide means whereby the fluid stored in thereservoir, is put under pressure by the pump and is transferred from thereservoir to the lifting piston assembly to elevate the load on thejack,and is then.

returned to the reservoir under control, to

lower the load as desired. This combination also provides that when itis desired to carry the jack in the car, it can be folded together tooccupy a comparatively small space, ready for immediate and convenientuse.

Manifestly numerous changes in the form of detail and plan ofconstruction of my hydraulic jack may be made without departing from thespirit and. scope of my invention or sacrificing any of its advantages.

I claim: V

1. In a hydraulic jack, a lifting piston, a base casting, aniope'rating' member pivoted thereto, comprising a fluid storagereservoir, a pump therein having a piston, a pump handle, a foldingconnection between the handle and piston, a guideway for the pump handlehinged to the reservoir and means through which fluid is transferredbetween the reservoir and the lifting piston.

v2. In a' hydraulic jack,ia lifting piston, a base casting, an operatingmember pivoted thereto, comprising a fluid storage reservoir,

a pump mounted therein having a piston, a

pump handle connected to the piston, means through which fluid istransferred between the reservoir and the lifting piston, including areturn passage, a valve in said passage and a cam controlling the valveoperated by the rotation of the pump handle on its longitudinal axis.

fluid is transferred from the reservoir to the lifting piston. i

4. In a hydraulic'jack, a lifting piston, a

' base casting, an operating member pivoted 5 thereto, comprising afluid storage reservoir, a pump therein having a piston, a pump handle,a folding connection between the handle and piston, a guideway for thepump handle mounted on the reservoir and means through which fluid istransferred from the reservoir to the lifting piston. v

5. In a hydraulic jack, a lifting piston, a base casting, an operatingmember, co'mpris ing a valve-carrying base block having a pivotconnection to the base casting, a reser voir mounted on the base block,ahead to said reservoir, a pump. mounted between the base block and thereservoir head, within the reservoir, a folding pump handle connected tosaid pump, and means through which fluid is transferred from thereservoir to the lifting piston. 6. In a hydraulic jack, a liftingpiston, a base casting, an operating member comprising a valve-carryingbase block having a valveless pivot connection to the basecasting, areservoir mounted on the base'block, a head to said reservoir, a pumpmounted on the base block within the reservoir, a folding pump handleconnected to said pump, a guide-way for said pump handle mounted on thereservoir head, and means through which fluid is transferred from thereservoir to the lifting piston, and from the lifting piston to thereservoir. I

7. In a hydraulic jack, a lifting piston, a base casting, an operatingmember comprismg a valve carrying base block having a valveless pivotconnection to the base casting, a reservoir mounted on the base block, apump mounted on the base block within the reservoir, a pump handleconnected with the ,pump, there being a main'passage in the base blockand leading from the pump through the pivot connection to the liftingpiston, a check valve in this passage, a passage from the reservoir tothe pump, a valve in this passage, a return passage from the mainpassage to the reservoir, a valve in this passage, and

. sage comprising a cam operated by the pump handle rotating on itslongitudinal axis.

'8. In a hydraulic lifting jack,a multi-part casing comprising a base, acylinder, and bearing lugs, a lifting piston, a pivot block pivoted inthe lugs supporting a pump, a res,- ervoir, valved passages in the pivotblock, a valve controlling the return of liquid to the reservoir, anoperating handle, connections for operating the pump by longitudinalreciprocation of the handle, and means actuated by rotation ofthevhandle about its longitu-.

dinal axis for actuating thesaid valve.

9; In a hydraulic lifting jack, a cylinder casing, a lifting piston inthe cylinder casmeans to control the Valve in the return pas-' ing, areservoir casing pivotally connected with the cylinder casing, a pumpcarried by a the reservoir casing, valved passages in the rotation ofthe handle about its longitudinal axis for actuating the said valve.

10. In a hydraulic jack, a casing a lifting piston therein, an operatingmember pivoted to the'casing comprisin a-reservoir and a pump, valvedconnections etween the reservoir, pump and casing, and a handle foldablyconnected with the operating member and adapted to operate the pump.

' 11. In a hydraulic jack, a casing, a lifting piston therein, anoperating member pivoted to the casing comprising a reservoir and apump, valved connections between the reservoir, pump and easing, anoperating handle, and means for supporting the handle on the. operatingmember whereby it may be folded into substantial parallelism with theoprating member or held in substantial alignment therewith.

12. In a hydraulic jack, a casing, a lifting piston therein, anoperating chamber comprising a reservoir and a pump, valved connectionsbetween the reservoir, pump and casing, an operating handle, and meansfor supportin the handle on the operating memv her where y it may befolded into substantial parallelism with thee-operating member or 14. Ina hydraulic jack, a casing, a lifting piston therein, an operatingmember comprising areservoir and a pump pivotally connected with thecasing, valved connections between the reservoir, pump and casing, anoperating handle, and means for supporting the handle on the operatingmember, and means whereby it may be folded into substantial parallelismwith the operating memberhor held in substantial alignment there- Wit15. In a hydraulic jack, a casing, a lifting piston therein,', anoperating member comrisin 'areservoir anda um ivotall con- 139 P a: P PP y nected with the casing, valved connections with, connections foroperating the pnmp by between the reservoir, pump and casing, anreciprocation. of the handle, and means for operating handle, and meansfor supporting controlling certain of the valved connections 10 thehandle on the operating member, and by rotation of the handle about itslongitu- 5 means whereby it may be folded into sub-. (hnal axis.

stantial parallelism with theoperating mem 7 v I her or held insubstantial alignment theref ALLAN J. MODONELL;

